Changes

*Small, non-moltile, Gram negative coccobacilli

*Small, non-moltile, Gram negative coccobacilli

*Facultatice intracellular pathogens

*Facultative intracellular pathogens

*Modified Ziehl-Neelsen positive - clusters of red coccobacilli on smears

*Modified Ziehl-Neelsen positive - clusters of red coccobacilli on smears

*Aerobic and capnophilic

*Aerobic and capnophilic

*''B. abortus'' lysed by specific bacterophages

*''B. abortus'' lysed by specific bacterophages

*Oxidative metaboloic rates can differentiate species

*Oxidative metaboloic rates can differentiate species

===Pathogenesis and pathogenicity===

===Pathogenesis and pathogenicity===